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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1507f8ebeb49a485381bdf2d7750ed08acdad89e1e7f1778c7a8a9e0d7cbf2f' 
  AND token = 'jfbmphM6aWZmk/QdRLS93Ah6eczMH13Jc8YwP+JreEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}